For 1990-2009 cars only
- Install the intake manifold, fitting the plenum duct over the intake manifold duct.
- Loosely install the intake manifold bolts.
- Tighten the intake manifold bolts in sequence (1-10).
- Tighten the plenum duct clamp (1) to the intake manifold.
- Inspect the fuel injector O-rings. Ensure the fuel injector O-rings are not missing, mis-aligned or damaged. Replace the O-rings if necessary.
- Lubricate the intake manifold fuel injector bores with light mineral oil GM P/N 9981704, clean engine oil, or equivalent.
- Install the fuel rail with fuel injectors as an assembly.
- Install the fuel rail studs.
- Install the fuel rail bracket nut to the engine lift bracket.
- Install the fuel injector wiring harness.
- Connect the fuel injector electrical connectors (1) to the fuel injectors.
- Install the PCV dirty air tube to the PCV orifice in the right camshaft cover and to the intake manifold.
- Install the PCV fresh air feed tube to the camshaft cover and the water crossover.
- Install the fuel pressure regulator vacuum tube to the fuel pressure regulator and the throttle body.
- Install the brake booster hose to the throttle body.
Notice: Refer to Fastener Notice in the Preface section.
Tighten
Tighten the intake manifold bolts to 10 N·m (89 lb in).
Tighten
Tighten the plenum duct clamp to 2.75 N·m (24 lb in).
Tighten
Tighten the fuel rail studs to 9 N·m (80 lb in).
Tighten
Tighten the fuel rail bracket nut to 10 N·m (89 lb in).
